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Song C.H.,Yichang Testing Technique Research Institute
Applied Mechanics and Materials | Year: 2013

This paper stadies the problem of the asymptotical stability for a time-delayed systems. By using LMI method, a new approach is used to derive a delay-dependent sufficient condition, which can guarantee that the time-delayed systems with multiple time delays is asymptotical stable. At last, a numberical example is given to show that the new theorem is more effective than the present methods. © (2013) Trans Tech Publications, Switzerland.

Zhou Y.-Y.,Yichang Testing Technique Research Institute
Applied Mechanics and Materials | Year: 2011

An example of a central air-conditioning project of a rebuilt department store is described in this paper. The design of air system, water system, layout and operations for the air conditioning system is presented in this paper. The system is different form ordinary ones because the floor height is lower; so many special considerations must be taken during the design. In addition, the low cost and easy maintenance place an important role in the design. The operational result of the design is promising and it can be referenced by other designers. © (2011) Trans Tech Publications.

Liu Z.,Yichang Testing Technique Research Institute
Advanced Materials Research | Year: 2012

There are many benchmark problems which have exact solutions or experiment data to gauge the simulation of aeroacoustic problems. Annular duct acoustic modes are good benchmark problems of this kind. The waves propagated along the duct can be considered as the summation of infinite Fourier modes. The energy relations of a single Fourier mode are deduced from governing equations in this paper. To investigate the properties of acoustic wave propagating along the duct, it's necessary to decompose acoustic waves in the duct into multiple Fourier modes; the decomposition methods are presented. © (2012) Trans Tech Publications.

Cao L.,Yichang Testing Technique Research Institute
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Due to the complex constraints, more uncertain factors and critical real-time demand of path planning for USV(Unmanned Surface Vehicle), an approach of fast path planning based on voronoi diagram and improved Genetic Algorithm is proposed, which makes use of the principle of hierarchical path planning. First the voronoi diagram is utilized to generate the initial paths and then the optimal path is searched by using the improved Genetic Algorithm, which use multiprocessors parallel computing techniques to improve the traditional genetic algorithm. Simulation results verify that the optimal time is greatly reduced and path planning based on voronoi diagram and the improved Genetic Algorithm is more favorable in the real-time operation. © 2015 SPIE.

Song C.H.,Yichang Testing Technique Research Institute
Applied Mechanics and Materials | Year: 2013

This paper drives the asymptotical stability conditions for a class of linear systems with time delay. First, a series of integral inequalities based on quadratic term are formulated by combining Leibniz-Newton formula. Next, based on Lyapunov-Krasovskii functional method and linear matrix inequality, the sufficient conditions of delay-dependent stability are derived to ensure the linear systems with time delay are asymptotically stable. Last, the results are illustrated by some numerical examples and the delay bounds obtained in this paper are of less conservative. © (2013) Trans Tech Publications, Switzerland.

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